package com.service;


import com.alibaba.dubbo.config.annotation.Reference;
import com.pojo.Permission;
import com.pojo.Role;
import com.pojo.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

@Component   //交给spring去处理
public class SpringSecurityUserService implements UserDetailsService {

    //使用dubbo通过网络远程调用提供方方法来获得数据库信息
    @Reference
    private UserService userService;

    //根据用户名查询数据库用户信息
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        if (user == null){
            //用户不存在
            return null;
        } else {
            List<GrantedAuthority> list = new ArrayList<>();
            //用户存在
            //动态为当前用户授权
            Set<Role> roles = user.getRoles();
            for (Role role : roles) {
                //遍历角色集合，为用户分配角色
                list.add(new SimpleGrantedAuthority(role.getKeyword()));
                Set<Permission> permissions = role.getPermissions();
                for (Permission permission : permissions) {
                    //遍历权限集合，为用户分配权限
                    list.add(new SimpleGrantedAuthority(permission.getKeyword()));
                }
            }
            org.springframework.security.core.userdetails.User securityUser = new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);
            return securityUser;
        }
    }
}
